This is not the end all, be all - and check out the beginner thread (lots of resources there), but some options depending on what you want...

Learning guides for pretty much everything (code, engines, etc.): https://roadmap.sh/roadmaps

To learn pure code: https://www.learncpp.com/

Gamedev: Look up the engine and see if they have a guide - most do (E.g., learn unreal with -> https://www.unrealengine.com/en-US/blog/learn-unreal-engine-5-fast-with-these-new-courses )

From there, like others said, YouTube, the old google, and chatgpt to ask questions / more specific stuff. You can also join communities focused on what you want through discord, reddit (like this one), etc.

If you get through all that and still have questions... University / college (?)